A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5998-01-360-3826
NSN 6610-01-653-8859
NSN 6650-00-095-6490
NSN 5985-00-958-9450
NSN 6620-01-147-8439
NSN 5965-00-445-1843
NSN 6145-01-310-1649
NSN 6220-00-588-1046
NSN 5950-01-113-5721
NSN 2925-01-041-8201
NSN 6650-01-310-3437
NSN 6135-01-448-4680